usb: hub: Parallelize power-cycling of root-hub ports

Untill now we power-cycle (aka: disable power on a port
and re-enabling again) one port at a time.
Delay of 20ms for Port-power to change multiplies with
number of ports in this case.
So better we parallelize this process:
disable power on all ports, wait for port-power to stabilize
and then re-enable the power subsequently.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

diff --git a/common/usb_hub.c b/common/usb_hub.c
index 1e225e6b3722986e11fe42891eb583480d4d9f63..4fbfacf2491eb9c4e9bc8092fce9f4d6a7a00bb0 100644 (file)
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -105,19 +105,22 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
        int ret;
 
        dev = hub->pusb_dev;
-       /* Enable power to the ports */
+
+       /*
+        * Enable power to the ports:
+        * Here we Power-cycle the ports: aka,
+        * turning them off and turning on again.
+        */
        debug("enabling power on all ports\n");
        for (i = 0; i < dev->maxchild; i++) {
-               /*
-                * Power-cycle the ports here: aka,
-                * turning them off and turning on again.
-                */
                usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
                debug("port %d returns %lX\n", i + 1, dev->status);
+       }
 
-               /* Wait at least 2*bPwrOn2PwrGood for PP to change */
-               mdelay(pgood_delay);
+       /* Wait at least 2*bPwrOn2PwrGood for PP to change */
+       mdelay(pgood_delay);
 
+       for (i = 0; i < dev->maxchild; i++) {
                ret = usb_get_port_status(dev, i + 1, portsts);
                if (ret < 0) {
                        debug("port %d: get_port_status failed\n", i + 1);
@@ -138,7 +141,9 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
                        debug("port %d: Port power change failed\n", i + 1);
                        return;
                }
+       }
 
+       for (i = 0; i < dev->maxchild; i++) {
                usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
                debug("port %d returns %lX\n", i + 1, dev->status);
        }